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APPENDIX 



The approximate variances of 6c and Pq were derived from the delta method 

 (Seber 1973): 



var[fixi,..., xi)]= X 



1 = 1 



_d_ 

 dxi 



fixi,..., XI ) 



warixi ) 



+ 2S -^fixi,...,xi)-^f{xi,...,xi)coyixi,xj) 

 i<j dxi dxj 



Exi, i = i,...,I 



var (a) was computed based upon Equation (10), i.e., 

 •(9)^(^)'var(a). 



var( 



149 



